Caliper brake

Abstract

A caliper brake which includes a fixing member, a pair of brake arms pivoted to the fixing member and each carrying a brake shoe, a return spring interposed between each of the brake arms and the fixing member, for biasing the brake arms to move them away from each other, with the return spring having spring legs respectively engageable with the brake arms, and a pair of inversion members which can be inverted to adjust the spring reaction force of the return spring. The inversion members each include a first contact portion and a second contact portion for making contact with a respective one of the brake arms. The inversion members include a fitting bore located at a position shifted from the center of the inversion member between the first and second contact portion, such that the fitting bore is closer to the first contact portion. The spring legs are respectively fitted in the fitting bores of the inversion members, whereby each of the inversion members is capable of being pivoted around the fitting bore so as to change its position between a first position at which the first contact portion makes contact with the brake arms and a second position where the second contact portion makes contact with the brake arms.

What is claimed is: 
     
       1. A caliper brake comprising: a fixing member;   a pair of brake arms pivoted to said fixing member and each carrying a brake shoe,   a return spring interposed between each of said brake arms and said fixing member, for biasing said brake arms in a direction of moving said brake shoes away from each other, said return spring having spring legs respectively engageable with said brake arms and   inversion members each comprising a first contact portion and a second contact portion for contacting with respective said brake arms and a fitting bore located at a position shifted from a center thereof between said first contact portion and said second contact portion closer to said first contact portion,   said spring legs being respectively fitted in the fitting bores of said inversion members, whereby each of said inversion members is capable of being pivoted around said fitting bore so as to change its position between a first position where said first contact portion makes contact with one of said brake arms and a second position where said second contact portion makes contact with one of said brake arms, such that said inversion members are inverted to adjust a spring reaction force of said return spring.   
     
     
       2. A caliper brake according to claim 1, wherein said brake arms have stoppers for stopping said inversion members, said stoppers comprising holders spaced apart from opposite surfaces of said brake arms and said inversion members being held between said holders and said opposite surfaces of said brake arms. 
     
     
       3. A caliper brake according to claim 2, wherein said inversion members each have at both lengthwise sides of said contact portions swollen portions engageable with side edges of each of said holders to prevent said inversion members from escaping from said brake arms. 
     
     
       4. A caliper brake according to claim 1, wherein each of said inversion members is provided with a resistance member in contact with said spring leg fitted into said fitting bore to apply resistance against movement of said spring leg with respect to said inversion member.